Xmodem can be used on a group of routers (see Components Used) and is used in disaster recovery situations where the router has no valid Cisco IOS software or bootflash image to boot from and hence, only boots up in ROMmon. This procedure can also be used where there are no Trivial File Transfer Protocol (TFTP) servers or network connections, and a direct PC connection (or through a modem connection) to the router console is the only viable option. Because this procedure relies on the console speed of the router and the serial port of the PC, it can take a long time to download an image. For example, to download Cisco IOS Software Release 12.1(16) IP Plus image to a Cisco 1600 Series Router with a speed of 38400 bps takes approximately 25 minutes.
It is also important to note that the -sdata-rate option is only available on the Cisco 1600 Series Routers and was implemented to overcome the console baud rate limitation of 9600 bps. If you specify -sdata-rate of 115200 bps for example, you can increase the download rate and hence, reduce download time. Other Cisco routers support console speeds up to 115200 bps. Therefore, the -sdata-rate option is not required.
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Ensure that the PC serial port uses a 16550 universal asynchronous transmitter/receiver (UART) if you download a Cisco IOS software image through the router console speed at 115200. If the PC serial port does not use a 16550 UART, it is recommended that you use a speed of 38,400 or lower.
In this example, all Flash memory is erased before the download with the f option (only on the Cisco 1600 Series ). Perform a CRC-16 checksum with the c option and specify -s115200 to set the download speed of 115200 bps (only on the Cisco 1600 Series
6. Per the message above, you need to exit your 115200 bps HyperTerminal session and restart a new one at 9600 bps. Once connected, the router ROMmon prompt appears. Verify that the download was successful with a dir flash :
Once in ROMmon, change the console baud rate from 9600 bps to 115200 bps to speed up the download time. Use the confreg command and complete the instructions presented on the screen. 2ff7e9595c
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